import { Ref } from "vue";
/**
 * Any function
 */
export declare type Fn = () => void;
export declare const isString: (val: unknown) => val is string;
/**
 * Maybe it's a ref, or not.
 *
 * ```ts
 * type MaybeRef<T> = T | Ref<T>
 * ```
 */
export declare type MaybeRef<T> = T | Ref<T>;
export declare const noop: () => void;
export declare function def<T extends object>(obj: T, key: keyof T, val: any, enumerable?: boolean): void;
export declare type Target = Ref<EventTarget | null> | EventTarget | string;
export declare function getTarget(target: Target): EventTarget;
export declare function tryOnMounted(cb: () => any): void;
export declare function tryOnUnmounted(cb: () => any): void;
export declare const isClient: boolean;